After joining the Amazon.com Associates program, you are eligible to receive a commission on all books purchased via a referral from your web site. These referrals typically originate through a link from the Ideas Collection in your web site. Go to Amazon.com for more information about the Amazon.com Associates program. After you have been accepted as an Amazon.com Associate, simply enter your Amazon.com Associates ID in the space provided, and click the Update button. The Ideas section of your website is configured to use your Amazon.com Associates ID to automatically identify purchases made through a referral from your web site. You probably won't earn enough referral money to fund your retirement, but you may be able to save some money the next time you shop at Amazon.com!